Vinyl resins plasticized with a mixture of diisodecyl phthalate and the 1, 4-butanediol diesters of capric and caprylic acids



Ute States Patent f 3,010,930 VINYL RESINS PLASTICIZED WITH A MIXTURE 0F DHSODECYL PHTHALATE AND THE 1,4- BUTANEDIOL DIESTERS 0F CAPRIC AND CAPRYLIC ACIDS Wesley D. Schroeder and Hermas N. Beaudet, Pittsburgh, Pa., assignors, by mesne assignments, to Pittsburgh Chemical Company, Pittsburgh, Pa., a corporation of Pennsylvania No Drawing. Filed Jan. 28, 1958, Ser. No. 711,646 9 Claims. (Cl. 260-316) This invention relates to plasticized vinyl resins.

More specifically, the invention relates to vinyl chloride resins plasticized with a mixture of the diesters of 1,4- butanediol with caprylic and capric acids and diisodecyl phthalate. I 7

It is known to use n-octyl-n-decyl phthalate as a pri mary plasticizer for vinyl resins, more especially poly vinyl chloride, and various vinyl'chloride copolymers'. This plasticizer has a unique combination of properties including good low temperature flexibility, a low order of volatility and good processing characteristics for vinyl chloride resins. This plasticizer has been in fairly short supply because of the decreasing availability of the particular straight chain alcohols used in its preparation. Additionally, this plasticizer is relatively expensive. Diisodecyl phthalate is a relatively low cost plasticize for vinyl resins and is satisfactory in most of its properties.

The mixed esters of 1,4-butanediol with caprylic acid and capric acid have been employed as plasticizers for vinyl resins. Such plasticizers have good-low temperature flexibility but are relatively costly and have poor volatility characteristics.

It is an object of the present invention to develop an inexpensive plasticizer as a replacement for n-octyln-decyl phthalate in preparing low temperature flexible 'vinyl resin compositions.

has low volatility and is easy to process. A further object is to prepare such a plasticizer which has good heat and light stability.

An .additional object is to develop a plasticizer for 1 .vinyl chloride plastisols having low viscosity at both high and low rates of shear as well as having good shelf life.

An additional object is to develop a plasticizer for vinyl chloride plastisols having low viscosity and good shelf life.

' A still further object is to prepare a plasticizer for vinyl resins having superior resistance to extraction by vsoap and water.

mers. pounds which have at least one vinylidene group,

3,010,930 Patented Nov, 28, 1961 ICC Preferably, there is employed 40 mol percentv caprylic acid and 60 mol percent capric acid, forming the.l,4- butanediol ester. Theproportions of caprylic acid. to capric acid can range from 35 mol percent to mol percent-of caprylic acid and corresponding, 65 mol per centto 55 mol percent of capric acid.

A small amount of caproic acid, e.'g., up to 3 mol percent, can be used to replace a portion of the caprylic acid and capric acid, but this is not preferred since there is a noted increase in volatility and also an increase in color formation. Generally, from 30 to 100 parts of the plasticizerare employed per 100 parts of vinyl. resin. A portion. of the primary plasticizer of the instant invention can be replaced by various secondary plasticizers, as is well known in the art. It has been found not onlydoes the plasticizer blend of the present invention compare favorably with the more expensive n-octyl n-decyl phthal- -ate in'low'temperature flexibility and other properties, butralso the use of 20% of the 1,4-butanediol ester of caprylic and capric acids Wilh 80% of diisodecyl'phthal- -ate was as satisfactory in low temperature flexibility and other properties as a blend of 35% dioctyl adipate and 65%'diisodecyl phthalate. Since diisodecyl adipate is atleast as expensive as the butanediol esters employed in the present invention and diisodecyl phthalate is comparatively cheap, the present invention has considerable seconomic advantage over the use of diisodecyl adipate.

It has also been found by using the 20% butanediol ester-80% diisodecyl phthalate blend that not onlyis outstanding low temperature flexibility obtained, but also that resins, more particularly vinyl chloride resins, excellent low temperature flexibility, exceptionally low volatility, good processability, superior resistance to extraction by l, -soap and water, unexcelled heat and light stability, low Another object is to develop such a plasticizer which shelf life to plastisols, good retention of physical properties in high temperature electrical insulation and good electrical properties. i

v The plasticizers of the instant invention can be utili zed ,with various vinyl-type polymers including homopolymers, copolymers and interpolymers of vinyl-type mono- The vinyl-type monomers include those com- I .C H =C in their molecule. Examples of vinyl-type Still further objects and the entire scope of applicability I of the present invention will become apparent from the detail description given hereinafter; it should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since .various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this;detailed description.

It has now been found that these objects can be attained by the use of a blend of 15 to 25% of the diester of 1,4-butanediol with a mixture ofcaprylic and capric acids and 85 to 75%,of diisodecyl phthalate as a primary plasticizer blendwith vinyl resins. 1 p p monomers which can be polymerized to form polymers which can be plasticized according to the present invention are styrene, alpha methyl styrene, dichlorostyrene, vinyl naphthalene, vinyl phenol, acrylic acid, alpha alkyl substituted acrylic acids, esters of these unsaturated acids, such as methyl acrylate, methyl methacrylate, butyl methacrylate, propyl acrylate, vinylidene halides, such as vinylidene chloride, vinylidene bromide and vinylidene fluoride,1vinyl-type esters of inorganic acids including the halogen acids and hydrocyanic acid, such as vinyl chloride, vinyl bromide, acrylonitrile, methacrylonitrile,

vinyl esters of monocarboxylic acids, such as vinyl acetate, vinyl chloroacetate, vinyl benzoate, vinyl propionate, vinyl valerate, vinyl laurate, vinyl stearate, vinyl esters of polycarboxylic acids, such as divinylsuccinate, divinyl adipate, vinyl allyl phthalate, vinyl'methallyl :pimelate,

vinyl methyl glutarate, vinyl esters of unsaturated acids,

such as vinyl acrylate, vinyl crotonate and vinylmeth- 3 acrylate, the vinyl ethers, such asvinyl methyl ether, vinyl ethyl ether, vinyl butyl ether and vinyl allyl ether and vinyl ketones, such as vinyl methyl ketone, vinyl ethyl ketone and vinyl butyl ketone. The plasticizers can also be used with polyvinyl acetals, such as polyvinyl formal, polyvinyl acetal and polyvinyl butyral resins.

Likewise, the plasticizers can be used with copolymers, such as butadiene-styrene, butadiene-acrylonitrile, isoprene-styrene, ethyl acrylate-styrene, vinyl acetaternethyl methacrylate-methacrylonitrile, is'obutylene-butadiene andisobutylene-isoprene.

Preferably, there is employed as the resin polyvinyl chloride or a copolymer of a predominant amount of vinyl chloride with a copolymerizable monomer. Such copolymers include vinyl chloride-vinyl acetate, vinyl chloride-vinylidene chloride, vinyl chloride-vinyl acetatemaleic anhydride, vinyl chloride-vinylidene chloride, vinyl chloride-.acrylonitrile, vinyl chloride-hutyl acrylate, vinyl chloride-vinyl hutyrate, 'vinyl chlorate-vinyl chlor-acet-ate, vinyl chloride-vinyl ethyl ether, vinyl chloridestyrene, 'vinyl chloride-p-chlorostyrene, vinyl chloridevinyl pyrrole, vinyl chloride-vinyl pyridine, vinyl chloridediethyl fumarate,vinyl chloride-diethyl maleate, vinyl chloride-butadiene, vinyl chloride-ethylene and vinyl chloride-isobutylene.

The plasticizers can even be used with cellulose derivatives, such as ethyl cellulose'and cellulose nitrate.

In the following examples and throughout the specification and claims, unless otherwise stated, all parts and percentages are by weight.

In Examples 1 to 7, the 1,4-butanediol ester. was prepared by reacting the alcohol with a mixture of 2 mol percent caproic acid, 55 mol percent caprylic acid and 42 mol percent capric acid commercially known as Aliphat 3-B. In Example 8, the 1,4-butanediol ester was pre pared from a purer acid mixture containing 40 mol percent caprylic acid (Aliphat 2) and 60 mol percent capric acid (Aliphat 3).

The general procedure for preparing the- 1,4-butane- Property Test method ASTM D412 (25 G.) (Scott Tester Model IP-4) Mechanical (a) Tensile strength, psi. (0) Ultimgate elongation, percen (c) Modulus at 100% elongation, p.s.i. '(d) Hardness, (Shore A). 2. Low temperature, Clash-Berg,

3. Volatility, activated carbon (hereinafter designated as 11.0. volatility).

. Permanence properties:

(a) Oil extraction, percent.. (0) Silicic acid migration.--

ASTM D-1043-51.

ASTM D-120352T (24 lire/90 0.).

ASTM 011 No. 3 (7 days/25 0.). (60 11 24 hrs.)

5. Mill processing test Two roll rubber mill (250 F.). 6 Heat stability Circulating air oven (350 F.). 7. Light stability Atlas-Fadeometer,M0delF-DA-B. (1) Brfiollrfii iekg tiscometer, Model viscosity of plasmas (2) seeigsc )extnision rheometer Plastisol formulations having to 100 parts of plasticizer per 100 parts of vinyl chloride resin were prepared using a double planetary-type mixer. Preferably, .the plasticizer is kept between 50 and 80 parts per 100 parts of resin. Both Brookfield and Severe viscosities were run on samples of the plastisols after aging 1 hour, 1 day, 7 days and 21 days.

Examples 1 to 8 show the properties of the 1,4-butane- 'diol esters prepared by the procedure outlined above.

Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 6 Ex. 7 Ex.8

Percent excess glycol 15 10 5 5 5 5 7 Activated carbon usedl.-- No No No No Yes Yes Yes Yes Specific gravity 25/25 C- 0. 924 9. 925 0.925 0. 922 0. 922 0. 922 0. 918 Acid number, mg. KOHlgm 0. 28 0. 04 0.02 0.02 0.02 0. 02 0.0 Saponification number, mg. KOH/gm- 300. 6 303. 9 305. l 304. 8 304. 5 304. 0 294 Hydroxyl value, mg. KOH/gm 27; 0 14. '7 10. 1 10. 5 7. 2 11. 2 6. 3 Viscosity at 25 0., centistokea- 12. 1 12.0 11.9 11. 9 ll. 9 11. 9 13. 6 Refractive index, 25 0., Np..- 1. 444 1.444 1. 444 1. 444 1. 444 1. 444 1. 445 APHA color, approx .l 400 400 350 325 115 110 200 50 Total reaction time, hrs p 1% 3% 4 7% 3 6% 3 .diol esters used in the presentinventionwas as follows: 'Iherew'as charged-into a vessel 1.05 to 1.15 mols of 1,4- butanediol, 2 mole of the indicated fatty acid mixture,'1 gram of toluene sulfonic acid and (when indicated in the example) 2 grams of activated carbon. In all cases, the charge was heated to'l50 C. with CO sparging at the rate of 2 cubic feet per hour and the water 'of reaction was drawn off at regular intervals. The heating was continued until the acid number dropped to about 3. Total reaction time wasusually 3-7 hours, depending on the amount of excess glycol present and the size of the batch. At the end of the reactiomlight soda ash was added to kill the catalyst. After filtering, the residual organic acid was, neutralized with a 5-10% :caustic soda solution. The crude ester was then washed severaltimes with hot water until the wash showed ajpH of 7.' The productw'as dried by heating to 110 C. for;2030 minutes, then finally treated with'0.5% each ofactivated carbon and Magnesol (hydrous magnesium-silicate). The

. acceptablecolorof the product was APHA'125.

As indicated in Examples l-7, the ester was made from a mixture of 2 mol percent caproic acid, 55 mol percent caprylic acid and 42 mol percent capric acid, while inExample 8, the ester was made from a mixture of capric acid and 40% caprylic acid.

For best heat stability in vinyl films, the plasticizer should have a low hydroxyl value, generally less than about 10. Since the diisodecyl phthalate has a hydroxyl value of 2 to 3, it is possible to have a slightly higher hydroxyl value in the butanediolester. The use of a 15 excess of the butanediol consequently gives a product having a hydroxyl number which is too high for optimum resin stability. EXAMPLE 9' Blends of various proportionsof the butanediol ester of Example 1 with diisodecyl phthalate were compared with n-octyl n-decyl phthalate as plasticizers for polyvinyl chloride using the formulationbelow (designated hereinafter as Formulation A):

' V V Parts Geon 101 (polyvinyl chloride, sp. gr. 11.40, av. spec.

viscosity 0.55)' V fiPlfiS-tiCiZBI' V 54 Mark XI (Ba-Cd-laurate) 2 ;Mark XX (a triaryl phosphate) 1 Percent butanediol ester of Example j I The results are shown in Table I. asflthe stabilizer in place of themixture of Mark XI and 7 XX with similar results. 1 Table I From Examples 9-12, it is evident that for the best combination of properties, such as modulus, low tem- Percent butanediol ester of nperature flexibility and volatility, the butanediol ester Example 4. total plasticizer Octyl should be within the range of 20-25% of the total of Property (balance dllsodccylphthalate) ndecyl th1s ester and diisodecyl phthalate to give a plastlcizer havphthal' ing properties most closely resembling n-octyl n-decyl 50 33% 25 20 ate phthalate. For low volatlhty properties and economic Tensile strength, p.s.i 2,710 2,860 2,810 2,850 2, 000 reasons the.lower f of the range about 20% Elongation, percent- 44 450 410 4 410 the butanedlol ester is preferred. Modulus (100 7) 1, 340 1,450 1,510 1,550 1,450 Shore hardnes (10 sec.) 85 86 s7 s7 s5 EXAMPLE 13 Clash-Berg, T5, 0.-.. -4s -42 -40 -39 -30 13, 0. i vo zi y v 5-: Z-g Formulatlon A was employed 1n comparing blends of 1% 55$;, 2:3 1 1 and of the butanediol esters of Examples 2 and S c c c migration 0 3 w1th n-octyl n-decyl phthalate. The results are shown in Table III.

Table III Percent butanediol Percent butanedlol ester of Example 2 "ester of Example 3 (balance diisodecyl (balance diisodecyl n-Octyl Property phthalate) phthalate) n-decyl H phthalate Tensile Strength, p.s.l.. 2,880 1 2,860 2,820 2,840 2, 000 Elongation, Percent.-- 420- 410 410' 400 410 Modulus (100%) 1,550 r 1, 540- 1,520 1, 500 1,450 Shore Hardness (10 sec.) 87 88 87 85 Clash-Berg, 1w o -39 -33 -3s -30 A.O. volatility 4.2 5.7 4.0 3.7 2.5 Oil extraction 5. 6 4.9 6. 0 4. 9 4. 5 1% soapy water extraction 1. 1 0.8 0.9 0. 8 0. 5 Silicic acid migration 5. 9 5.6 6. 2 6.0 5. 2

FADEOMETER TEST (1) After 150 hours Nochange Nochange Nochange Nochange Nochange (2) After 400 hours Spotting, Spotting, Spotting, Spotting, Spotting, darkendarkendarkendarkendarken- I ing. ing. ing. lng. ing. Window exposure after 5months Nochange Nochange No change Nochange Nochange.

EXAMPLE EXAMPLE'14 Example 9 was repeated using 3 parts of Mark XI asi the stabilizer in place of the mixture of Mark and Mark XX with comparable results.

EXAMPLE 11 with diisodecyl phthalate with dioctyl phthalate, as well as with 100% diisodecyl phthalate. shown in Table II.

The results are Table II 6 in total plasticizer (balance diiso- Di- P e t decyl htllalate) octyl mp r y p phthalate 0 15 17. 5 20 25 Tensile strength, 1) s i 2, 900 2,920 2, 860 2, 900 2, 800 2,890 Elongation, percen 38 390 400 400 390 350 Modulus (100%) 1, 780 1, 680 1, 580 1, 570 1, 560 1, 640 Shore hardness (10 sec.) 89 87 86 86 86 86 OlashBerg, Ti, C 28 32 -35. 5 36. 5 -38. 5 28 A.C. volatility 1.8 3.5 3.7 3.7 4.2 Q 4.8 Oil extraction 1.6 4.0 4.3 5.0 5.5 1.3 1 ater extracls io lfi j u? 0. 0 0. 7 0.8 0. 9 1. 2 0.9 Silicic acid migratiom 3. 7 5. 3 5. 7 5. 7 6. 2 4. 0

EXAMPLE 12 Example 11 was repeated using 3 parts of Mark XI 7,

.isodecylxphthalate as the fabrics, dipped goods and molded articles.

Example 13 was repeated using 3 parts of calcium 0 stearate in place of the Mark XI and Mark XX comparable results.

An important consideration in a vinyl resin plasticizer is the relative speed with which it solvates the resin. In

a mill processing test at 250 F. the fluxing time to band on the rolls using-Formulation A was 5 minutes with diplastici zer, 4.5 minutes using 80% diisodecyl phthalate and 20% of the butanediol ester of Example 6 as the plasticizer, and 3.5 minutes using of diisodecyl phthalate and 25% of the butanediol ester of Example 6 as the plasticizer. The useof the butanediol ester thus lowers the fluxing time required as compared with diisodecyl phthalate as the sole plasticizer. The plasticizers of the instant inventionalso are useful in vinyl dispersion applications, particularly in plastisols.

Such plastisols are used tov make good quality'.coated EXAMPLE. 15

. The butauediolester of Example 5 was 'blendedwith diisodecyl phthalate in 20 and 25% blends (balance being the phthalate) andcompared with n-octyl n-decyl phthalate in vinyl chloride resin plastisols. Geon 121 'Was the vinyl chloride resin used in' this example. The

results are sh'own in Tables IV and V.

ing initial viseosities of one hour oldplastisolsandthen Table IV allowing the plastisols to heat age at 110? F. for 18 hours I p p R t 7 i ig .13 k viswsflgm noises 1n a circulating a1r oven and then allowing the plastrsols 11100 e urooaer- Ragtime: total Sm field to come back to room temperature for measuring. The p g m 1 7 21 best viscosity stablhty'was obtained wlth the blend conre 81, V

p.s.i. day days days taming 20% of the butanedrol ester but the 25% blend also was considerably superior to the n-octyl n-decyl Butanediol ester/ 60 to 100 20 84 106 100 hthal dhsodecylphthalso to 100 so 195 223 221 P a ZEQ' Q EQ (13135 2823 2 If; m The preferred butanediol ester of Example 8 was used Bntanedlol ester] so to 100 .20 so 88 av dilsodeeylphthal- 60m 100 80 170 186 102 m the ionowmg examples ate (25/75) (Plasso to 100 12 34 40 3s tleizer B). 23 go 1 so 31 3g :33 n-Oetyl n-deeyl 01 7 'Phthelate 33% i3?) '12 158 1 EXAMPLE I 42 5s s2 16 0% 00 to 100 as as so 54 V 7 382 18% i8 32 iii lit 0 1 Hashim! 80 to 100 12 11. 0. 12. 0 12.0

2% lg tag i3 9 {kg In this example a different batch of Geon 101 was used 00 to 100 so 17. 0 17. 5 1s. 6 PlastrclzerB 80 mm 12 mo 13.0 12,0 from that m the previous examples. The composrtions g8 fig 36 lg-g lag ig-g all contamed 100 parts of Geon 101 and 3 parts of a Phsficizet 0 gig to 1 g 80 1:11;; 231g 221g 111g stabilizer (the stabilizer was made of 2 parts Mark XI 0 i so to 100 as 10. 0 10. 0 and 1 part Mark XX) and the indicated amounts of plas- Plastlcizer A 2% 5 e2 trclzer. The results are shown in Table VI. The plasticizers of the resent invention were tested in Table VI 5.0 6.0 6.0 P P1 ti 2 B 2-2 g; at ratios of vinyl chloride resin to plasticizer of 70% to 28 2-8 g-g 30%, 65% to and 60% to while the dusodecyl 10010100 0 6.0 6-7 phthalate and the n-ootyl n-decyl phthalate were tested ma'smmro 100to100 so a 5.5 6.0 0.1 30

100 to 100 12 8.0 7.0 0.0 at a ratio of vinyl chlonde resin to plasticrzer of 65% to 10010100 so 5.0 6.0 6.0 e a 35% only.

. Table V PLas'rrsoL VISCOSIIIES-EFFEOT or HEAT AGING FOR 18 HOURS AT 110 F.

' Parts plastlelzer per 100 parts vinyl chloride resin Savers, Brook- .60 80 Plastlcizer psi. field,

D After 1 18 hours Percent Alter 1 18 hours Percent hour at 110 ehazngein hour at 110 changein F. viscosity F. viscosity 40 174 24 Phat-101191 A 51 91 12. 0 18.0 28V 0s 10. 0 1s. 5 as e 83 as s: s

112 149 a Plasma" B as as 135 10.0 16.0 25 as 124 '0. 0 13. 2 41 r -48 100 10s 1%.: 3% g;

2 as ea PlastielzerO 934 i20 250 1 91 29 98 240 9. 0 19. 0 111 From Table IV it is seen that plastisols containing the 55 Table VI plasticizers of the present invention at both the ZO and H V 25% blends have somewhat higher initial viscosities than P1353011 Paris of g gg g 8 3 100 Parts corresponding plastisols containingn-octyl n-decyl phthal- 7 ate when measured at high rates of shear with the Severs 60 205 1, l ut r di l eslteialoialilxample v Extrusion Rheometer. When measnred at relatively low 7 g Z ig f ate fi "fig-1:: rates of shear with the Brookfield Visoometer, the blends 'f V 54 of fil mvemmn Japan than th? PROPERTIES on THE VINYL RESIN COMPOSITION 7 n-octyl n-decyl phthalate. In all cases, there was excellent vrsc' osity stability in aging; At 80 and 100 parts of Tensile strength 2, gg 2, 2, 3 plasticlzer per 100 parts of resin, there was very httle g g g g ad i 2,180 3% 33 33 22 l I ore a! D955 S90. difference m vissoirty between :16 lplagglclizetr blends of g fi f gig g67am 3 3 g g ne a a e V0 8 i y rs. 2. 3.4 1.7 3.0 t 6 m t e n Cy P r r V 11.0. volatility (10 0.121 hrs.). 1 0.7 0.9 1.0 0.6 1.2 As shown 1n Table V-, however, the plastlclzer blends $yilextractio11g 0$ldgy 1.0 gs 6.7 1 1.2 3.0 r e sea We er s. O. .4 0.4 0. of the present 1nvent1on lmpart extreme good viscosity giileicg id 1 3 0 0.124 nr s.) 2 2. 3 2. as 3.3 A V a ears rang 9 420 510 50 stability, particularly when working at elevated tempera g tgi g E gg 2 5 3 M 1&0 240 M3 15.

v v is'ewaere a on lures. .The results 111 Tab e V were obtained by .measur 7 dawn 0.1 M 0.1 p M Table VII 011x05 (mol ratio) A.C. vola- Clash-Berg tility Ti, C.

The C :C mol ratio of 60:40 gives an acceptable activated carbon volatility at the lowest price and, hence, is preferred even though it is slightly inferior to the 75 :25 mol ratio in activated carbon volatility.

The low temperature flexibility properties of the products of the invention are such that they can be used in vinyl chloride resin formulations without blending with special low temperature plasticizers for such applications as automotive upholstery, toys, e.g., squeeze toys, doll heads and bodies, garden hose, wearing apparel, foams and sponges, e.g., insulation, upholstery padding, sports equipment, electrical insulation, shower curtains, rainwear, baby clothes, table cloths, floor tile, gloves, etc.

The preferred 1,4-butanediol ester-diisodecyl phthalate formulation of the invention (C zC ratio 60:40 and butanediol estersphthalate ratio 20:40), has a 100% modulus approximately equivalent to dioctyl phthalate and may thus be readily substituted for this phthalate.

EXAMPLE 17 The butanediol ester of Example 8 was blended with diisodecyl phthalate in a 20:80 blend and compared with n-octyl n-decyl phthalate as Well as straight diisodecyl phthalate in vinyl chloride resin plastisols. Geon 121 was the vinyl chloride resin used in this example. Geon 121 is a polyvinyl chloride having a specific gravity of 1.41 and an average specific viscosity of 0.59. The results are shown in Table VIII.

Table VIII Viscosity (poises) Ratio of Brookafter aging- Plastieizer plasticizer Savers, field,

to resin p.s.i. rpm.

1 24 14 hr. hrs. days so to 100 20 72 7s 81 l ester/ 60 to 100 so 145 154 183 phthalate 60 to 100 12 34 39 45 (zolsmso to 100 3o 31 35 40 so to 100 20 4o 58 67 n-Octyl necyl 60 to 100 80 104 113 126 phthalate. 60 to 100 33 4o 59 so to 100 3o 29 as so 111 131 a so Dumdecyl phthal i8 12 72 so 84 so to 100 30 6g 5 8 2 so to 100 20 1 Blltanedml ester/d1 so to 100 so 1s. 6 18.6 19. smecyl phthalate so to 100 12 12. 0 13. o 14. 0 (zolsm' so to 100 30 11.0 11. 0 12.0 so to 100 20 12.2 13.8 16.1 n-Octyl n-decyl 80 to 100 80 13, 14.7 16. 9 phthalate. so to 100 12 11. o 12.0 14. 0 so to 100 30 o. 0 10.0 13. 0 so to 100 2 Diisodee l hthal- 80 to 100 8 ate. y p so to 100 12 23. 0 25. o 28.0 801:0 o 30 22.0 23. o 25. o

The results with the plasticizers of the instant invention are comparable to the results obtained with n-octyl n-decyl phthalate. The plasticizers of the present invention impart low initial viscosity and exceptional viscosity stability to vinyl chloride resin plastisols as set forth supra. Consequently, the shelf life of vinyl resin dispersions is considerably improved.

EXAMPLE 18 [Wire insulation] Parts Resin, electrical grade, Pliovic EG 90 V (polyvinvl chloride) 100 Plasticizer D 54 Epoxy plasticizer, specifically butyl epoxy stearate (Terry Patent 2,559,177) 4 Dythal (dibasic lead phthalate) -1 6 Mark XI 2 Pigment No. 33 (Kaolin type clay) 10 We claim:

1. A composition comprising a polymer of a vinylidene group containing compound and as a plasticizer for the polymer a mixture of (a) 15 to 25% of the 1,4- butanediol diesters of caprylic and capric acids and (b) 85 to 75% of diisodecyl phthalate.

2. A composition according to claim 1 wherein the mixture of 1,4-butanediol diesters contains 40 mol percent of caprylic acid and 60 mol percent of capric acid as the esterifying acid.

3. A composition comprising a vinyl chloride resin and as a plasticizer for the resin a mixture of (a) 15 to 25% of the 1,4-butanedio1 diesters of caprylic and capric acids and (b) 85 to 75% of diisodecyl phthalate.

4. A composition comprising a vinyl chloride resin and as a plasticizer for the resin a mixture of (a) 15 to 25% of the 1,4-butanedio1 diesters of caprylic and capric acids, 40 mol percent of the esterifying acid being caprylic acid and 60 mol percent of the esterifying acid being capric acid and (b) 85 to 75 of diisodecyl phthalate.

5. A composition according to claim 3 wherein 20% of the plasticizer is the butanediol esters and 80% is diisodecyl phthalate.

6. A composition according to claim 4 wherein 20% of the plasticizer is the butanediol esters and 80% is diisodecyl phthalate.

7. A composition comprising 60 to parts of a vinyl chloride resin and 40 to 30 parts of a mixture of (a) 15 to 25 of the 1,4-butanediol diesters of caprylic and capric acids and (b) 85 to of diisodecyl phthalate.

8. A composition comprising 60 to 70 parts of a vinyl chloride resin and 40 to 30 parts of a mixture of (a) 20% of the 1,4-butanediol esters of caprylic and capric acids, 40 mol percent of said esters being the caprylic acid ester and 60 mol percent of said esters being the capric acid ester and (b) of diisodecyl phthalate.

9. A composition according to claim 1 wherein 35 to 45 mol percent of the esterifying acids is caprylic acid and correspondingly 65 to 55 mol percent of the esterifying acids is capric acid.

References Cited in the file of this patent FOREIGN PATENTS Canada Jan. 15, 1957 OTHER REFERENCES 

1. A COMPOSITION COMPRISING A POLYMER OF A VINYLIDENE GROUP CONTAINING COMPOUND AND AS A PLASTICIZER FOR THE POLYMER A MIXTURE OF (A) 15 TO 25% OF THE 1,4BUTANEDIOL DIESTERS OF CAPRYLIC AND CAPRIC ACIDS AND (B) 85 TO 75% OF DIISODECYL PHTHALATE. 